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The Democratic-aligned Majority PAC doubled down on attacking Republican businessman John Brunner, launching a new television ad days before the Missouri GOP Senate primary.

The group hits Brunner, the GOP frontrunner in the primary, over the number of jobs he's claimed to have created with his personal care products company. It's a clear sign that the Democratic group views him -- and his millions he could use to self-finance the race -- as McCaskill's most formidable opponent.

"After saddling his company with over $245 million in debt, Brunner merged with another company that already had hundreds of existing jobs. In Tennessee," says the narrator. "That's not creating jobs, he's taking credit for jobs that were already there."

The group released its first ad targeting the businessman last month. After that ad, Brunner ran one of his own saying Democrats were attacking him because they know he'd be the strongest candidate to take on Democratic Sen. Claire McCaskill. As Sean Sullivan wrote, the Majority ads may be an attempt to elevate Rep. Todd Akin, the Democrats' preferred opponent. Former state Treasurer Sarah Steelman also is running aggressively in the final stretch, winning an endorsement from Sarah Palin.